Suction roll and method of drilling same



July 2, 1935. A. H. STANDLEY 2,006,519

sUCTIoN HOLL AND METHOD oF DRILLING SAME Filed April 5, 1954- Patented July 2, 1935 UNETED STATES PATENT OFFICE Albert H. Standley, Downingtown, Pa., assigner to Downngtown Manufacturing Company, Downingto'wn, Pa., a. corporation of Pennsyl- Vania.

Application April 3, 193e, Serial No. 718,880

3 Claims.

iis invention relates to suction rolls, and more Jieularlv to a method oi drilling the same to prevent water-throwing by the roll in operation. As is well known to those familiar with the art, t 5 a suction roll comprises a perforated shell rotating about a stationary suction box, the suction of which operates through the openings of the shell to withdraw water from a web-supporting carrier traveling over the shell. Since the sucl@ tion effort is exerted throughout the box area, water is drawn into the openings of the shell. until the time when the shell passes over the final packing strip of the suction box, consequently, a certain amount of water is left in the openings i hich is not drawn into the suction bog and this water tends to throw from the openings under the influence oi centrifugal force. 'il'.he dying particularly with a rapidly rotating suction roll, is often objectionable to the mill operator, particularly where this water, in leaving the roll, is thrown against the carrier on which the roll operates lor the purpose of drying the saine.

.en important object oi this invention is provision ci a suction roll construction in which the openings are so arranged that they tend to overcome the action of centrifugal force and thus prevent water termint7 and further tend to act as buckets taking in air :from the outer ends as the 'roll is rotated so that the air further acts prevent outward movement of water in the openings instead ci acting to assist the same as the usual construction.

These objects l attain by arrangimT the oper-l ings of the shell as illustrated in the accompanylng drawing in which The figure shows an enlarged section of a suc= tion roll shell with a contacting felt and a fragment of an associated press roll.

In accordance with my method, the openings l0 4U of the shell ll are given a circumferential rake, having their outer ends in advance of their inner ends as regards the direction of rotation of the shell indicated by the arrow in the drawing, the axis of these openings being preferably similarly tangential to atheoretical cylinder l2 of predetermined diameter coaxial with shell li.

It will. be obvious that with this arrangement, centrifugal force, which operates radially, will tend to force the water against the rear wall oi the opening rather than directly from the opening as in the ordinary construction,v and that the friction thus set up resisting the outward movement of the water will be assisted during the upper cycle of rotation of the roll by gravity .g

nient of the water outwardly in the openings while with the openings canted iorwardly in the direction of rotation, as in the present structure, this current instead of producing an aspirating eiect produces a pressure effect in the opening which further assists in preventing outward movement of the water. Additionally, as the openings more nearly approach the carrier, e trapped between the carrier and the periphery 1 the roll will be' forced through these openings increasing the inward pressure exerted on water in the openings. The openings lli may be given any suitable rake angle although this angle should. not be increased to an extent leading to dinlcuh ties in :formation or the openings as a result of the sharp angle between the drill and the suilace the shell il,

oiaimt l. suction roll shell adapted :or rotation in a given direction and having suction openings formed therein, those portions of said suction openings which extend through the periphery of the shell being axially inclined radially forwardly in the direction of rotation.

2. A suction roll shell adapted for rotation in a given direction and having suction openings formed therein, those portions of said suction openings which exten-d through the periphery of the shell being axially inclined radially forwardly in the direction of rotation, said openings being tangential to a cylinder coaxial With the shell.

3. A suction roll shell having drilled suction openings, the outer yends of the suction openings being in advance as regards the direction of roJ tation of the shell.

ALBERT H. STAND 

